noun
wall map; wall chart
A large map or chart hung on a wall, often used in classrooms or presentations.
教室の前に世界地図の掛け図が貼ってある。
A wall map of the world is posted at the front of the classroom.
先生は掛け図を使って歴史の年表を説明した。
The teacher used a wall chart to explain the historical timeline.
Compound of 掛け (hanging) + 図 (diagram, chart).